Purification of Water

Q. Consider the following treatment steps in a conventional wastewater treatment plant:
1. Loading and sedimentation
2. Chlorination or ozonization
3. Aeration
4. Filtration
The correct sequence of these steps is

1. 2-1-4-3
2. 1-4-3-2
3. 3-1-4-2
4. 1-2-4-3

Q. Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

1. Only (ii) and (iii) are correct
2. Only (i) and (ii) are correct
3. (i), (ii) and (iii), all are correct
4. Only (i) and (iii) are correct

Q.

Identify the name of the process that is used to obtain pure water for industrial purpose.

1. Filtration

2. Distillation

3. Boiling

4. Chlorination

Q.

___ is the action of purifying a liquid by a process of heating and cooling.

Q.

In the waste water treatment plant (WWTP) air is pumped into water to:

1. Support the growth of anaerobic bacteria

2. Support the growth of aerobic bacteria

3. Disinfect water

4. Blow human waste

Q.

What is the process for wastewater treatment called?

1. Sewage treatment

2. Chlorination

3. Filtration

4. Water treatment

Q.

Water treatment plant is a must for industries generating sewage.

1. True
2. False

Q. Arrange the following steps of water treatment in the way they occur in a water treatment plant.

1. Sedimentation
2. Loading
3. Filtration
4. Chlorination

Q. tank is used in purification of water, to remove heavy solid impurities by allowing them to settle down at the bottom.

1. Sedimentation
2. Loading
3. Filtration

Q.

In the treatment of water, solid impurities are allowed to settle to the bottom. This particular stage in the entire purification is called ___

1. Distillation

2. Chlorination

3. Sedimentation

4. Sublimation